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August 19, 2025—KB5066189 (OS Builds 22621.5771 and 22631.5771) Out-of-band

🗓️ 19 Aug 2025 00:00:00Reported by MicrosoftType 
mskb
 mskb
🔗 support.microsoft.com👁 3 Views

KB5066189 fixes reset issues and warns of Secure Boot certificate expiration; update to Windows 11 23H2.

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09 Sep 2025 00:00Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.8
EPSS0.00501
SSVC
3